Microleakage evaluation of bonded amalgam restorations: confocal microscopy versus radioisotope.
The purpose of this study was to compare the degree and pathway of microleakage in bonded amalgam restorations utilizing fluorescent dyes with scanning laser confocal microscopy and 45Ca radioisotope with autoradiographs. Mesial slot preparations with enamel cervical margins and distal preparations with dentin margins were prepared in extracted human molars. Four liners, Copalite (control) All-Bond 2/Resinomer, Amalcoden, and Panavia 21, were used. Teeth were restored with Dispersalloy or Tytin. After thermocycling, 7 days' storage, and staining, the degree of microleakage was measured on an ordinal scale. Dental adhesive liners minimized microleakage; the ranking was, from most to least effective, All-Bond 2, Panavia 21, and Amalcoden. The control exhibited the greatest microleakage. Microleakage occurred most frequently at the liner-tooth interface. No significant difference was observed between amalgams. The high correlation between the results of the fluorescent and radioisotope studies indicated that these two microleakage tests can be directly compared.
Tangsgoolwatana
J
J
Department of Restorative Dentistry, Indiana University, School of Dentistry, Indianapolis 46202, USA.
Cochran
M A
MA
Moore
B K
BK
Li
Y
Y
D001345:Autoradiography; D002132:Calcium Radioisotopes; D003723:Dental Amalgam; D001840:Dental Bonding; D003763:Dental Leakage / Q000000981:diagnostic imaging / Q000473:pathology / Q000517:prevention & control*; D003793:Dental Restoration, Permanent / Q000379:methods; D005456:Fluorescent Dyes; D006801:Humans; D066298:In Vitro Techniques; D018613:Microscopy, Confocal; D008963:Molar; D011877:Radionuclide Imaging
D002132:Calcium Radioisotopes; D005456:Fluorescent Dyes; D003723:Dental Amalgam